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The following are questions from the National Institute for Automotive Service Excellence (ASE) test for school bus technicians, which certifies technicians as the best in their industry.
An air-operated stop arm will not fully extend. Which of these is the most likely cause?
(A) Low air pressure
(B) Binding hinge pivots
(C) A sticking solenoid valve
(D) A broken return spring pivot
A replacement student window side glass should:
(A) Meet FMVSS requirements
(B) Be tempered
(C) Be laminated
(D) Be replaced by a glass company
The automatic transmission fluid of a school bus is discolored and has an unusual odor. The most likely cause is:
(A) Overrunning the engine governor
(B) Overheating the transmission
(C) A dragging spring (parking) brake
(D) Improper gear selection
The most likely cause for no air pressure in the secondary air resevoir tank is a/an:
(A) Improperly adjusted air governor
(B) Plugged one-way check valve
(C) Weak pressure relief valve
(D) Restricted compressor main discharge line
All of these must be checked before aligning the front wheels on a school bus EXCEPT:
(A) Tire pressure
(B) Trim height
(C) Wheel bearing adjustment
(D) Tire balance
Answers: (A), (A), (B), (B), (D)

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